stackwith.me — camera reference excerpts
Source snapshot: 2026-10-28

These are excerpts from the local source used to prepare this edition.
They describe code, not a successful browser test or the state of a live service.
Line numbers refer to the original file. Full-file SHA-256 identifies that version.


File: src/assets/js/lab3d.js
SHA-256: 3f225103d28459067f921c36e607e732912eed57e3c6bb652118a60dfa4433ca
Lines 648–675

 648    let hidden = document.hidden, qIdx = 0, emaMs = 16.7, qCooldown = 120;
 649    let lastFrameStamp = performance.now() / 1000;
 650    const sample = { position: new THREE.Vector3(), target: new THREE.Vector3(), fov: 45 };
 651    sampleLabJourney(0, W / H, sample);
 652    const currentPosition = sample.position.clone(), currentTarget = sample.target.clone();
 653    listen(document, "visibilitychange", () => { hidden = document.hidden; if (hidden) chargeRelease(true); requestFrame(); });
 654    listen(window, "resize", () => {
 655      W = innerWidth; H = innerHeight; camera.aspect = W / H; camera.updateProjectionMatrix();
 656      setSize(dprNow); requestFrame();
 657    });
 658    listen(canvas, "webglcontextlost", event => { event.preventDefault(); no3d("The 3D connection was interrupted. The still edition is ready below."); });
 659    listen(window, "pagehide", event => {
 660      mem.lastISO = new Date().toISOString(); memSave();
 661      if (!event.persisted) disposeWorld?.();
 662    });
 663  
 664    window.__labQ = () => ({
 665      rendered: live, frames, paused: motionPaused, time: +labT.toFixed(3), chapter: activeCh,
 666      progress: +progress().toFixed(3), sceneProgress: +sceneProgress.toFixed(3), cameraSettled,
 667      qIdx, dpr: dprNow, disp: 0, rip: ripCount, echo: echoCount, stoneRip: stoneRipCount, chime: chimeCount,
 668      charge: +charge.toFixed(3), charges: mem.charges, chargeArmed, pocket: PHONE, ruin: 2,
 669      keystone: exhibits.diagnostics().keystone, visits: mem.visits, memoryPersists: memPersists,
 670      tx: txEl?.textContent, bootLines, emaMs: Math.round(emaMs), camera: camera.position.toArray(),
 671      drawCalls: renderer.info.render.calls, triangles: renderer.info.render.triangles,
 672      landscape: landscape.diagnostics(), exhibits: exhibits.diagnostics(), journey: "frozen-exhibits",
 673      atmosphere: atmosphere ? { enabled: atmosphere.enabled, steps: atmosphere.fog.defines.AIR_STEPS } : null,
 674      arrivalTime: +arrivalTime.toFixed(3), entranceReady,
 675    });


File: src/assets/js/lab3d.js
SHA-256: 3f225103d28459067f921c36e607e732912eed57e3c6bb652118a60dfa4433ca
Lines 678–725

 678      if (hidden || disposed || bootCancelled || (motionPaused && !renderRequested)) { lastFrameStamp = now; return; }
 679      if (!renderRequested && elapsed < 1 / (PHONE ? 45 : 60)) return;
 680      lastFrameStamp = now; renderRequested = false;
 681      const dt = motionPaused ? 0 : Math.min(.05, elapsed);
 682      const cp = progress();
 683      if (!motionPaused) {
 684        labT += dt;
 685        emaMs += (Math.min(100, elapsed * 1000) - emaMs) * .05;
 686        if (--qCooldown <= 0) {
 687          let next = qIdx;
 688          if (emaMs > 30) next = Math.min(QCAPS.length - 1, qIdx + 1);
 689          else if (emaMs < 17) next = Math.max(0, qIdx - 1);
 690          if (next !== qIdx) { qIdx = next; dprNow = Math.min(devicePixelRatio || 1, QCAPS[qIdx]); setSize(dprNow); }
 691          qCooldown = 240;
 692        }
 693        for (let i = echoQueue.length - 1; i >= 0; i--) {
 694          const echo = echoQueue[i]; if (echo.at > labT) continue;
 695          if (echo.index < 0) landscape.strike(echo.point, labT); else exhibits.strike(echo.index, labT);
 696          chimeRef?.(echo.point.x - camera.position.x, echo.point.y, echo.point.z, echo.octave);
 697          echoQueue.splice(i, 1); echoCount++;
 698        }
 699      }
 700      chargeArmed = cp > 2.98 && cp < 3.38;
 701      if (!chargeArmed) chargeRelease(true);
 702      if (charging && chargeArmed) charge = heldCharge(now);
 703      else charge *= Math.exp(-dt * 7);
 704      chargePanel.hidden = !chargeArmed; chargeCue.disabled = motionPaused;
 705      chargeCue.querySelector("[data-charge-label]").textContent = motionPaused ? "Resume to charge" : "Hold to charge";
 706      const percent = Math.round(charge * 100);
 707      if (percent !== lastChargePercent) { chargeValue.textContent = `${percent}%`; chargeMeter.value = charge; lastChargePercent = percent; }
 708  
 709      // The assembly begins in view, rather than running behind the loader.
 710      // Its clock freezes with Pause and does not restart on chapter navigation.
 711      if (arrivalStart === null && entranceReady) arrivalStart = labT;
 712      arrivalTime = arrivalStart === null ? 0 : Math.max(0, labT - arrivalStart);
 713      sampleLabJourney(cp, W / H, sample);
 714      const approach = (1 - THREE.MathUtils.smootherstep(arrivalTime, 0, ICE_ARRIVAL_DURATION))
 715        * (1 - THREE.MathUtils.smoothstep(cp, .04, .38));
 716      sample.position.sub(sample.target).multiplyScalar(1 + approach * .10).add(sample.target);
 717      sample.position.x += approach * .36;
 718      sample.position.y += approach * .20;
 719      sample.position.x += pointer.x * .16;
 720      sample.position.y += pointer.y * .08;
 721      if (motionPaused || !frames) { currentPosition.copy(sample.position); currentTarget.copy(sample.target); }
 722      else { const ease = 1 - Math.exp(-dt * 8); currentPosition.lerp(sample.position, ease); currentTarget.lerp(sample.target, ease); }
 723      cameraSettled = currentPosition.distanceToSquared(sample.position) < .0009 && currentTarget.distanceToSquared(sample.target) < .0009;
 724      camera.position.copy(currentPosition); camera.lookAt(currentTarget);
 725      camera.fov = sample.fov - charge * 1.3; camera.updateProjectionMatrix();